Shelf for a display case for watches



FIG. 1 is a front view of my new and ornamental design for display cases for watches;

FIG. 2 is a rear view therof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof. 

The ornamental design for shelf for a display case for watches, as shown and described. 